Campbell Scientific CR10X Measurement and Control System - Manual (Page 220)

SECTION 14. INSTALLATION AND MAINTENANCE
14-4
TABLE 14.3-1. Typical Alkaline Battery
Service and Temperature
Temperature (°C) % of 20°C Service
20 - 50 100
15 98
10 94
5 90
0 86
-10 70
-20 50
-30 30
NOTE: This data is based on one "D" cell
under conditions of 50 mA current drain
with a 30 ohm load. As the current drain
decreases, the percent service improves for
a given temperature.
14.3.2 PS12LA LEAD ACID POWER SUPPLY
The PS12LA power supply includes a 12 V, 7.0
amp-hour lead acid battery, a AC transformer
(18 V), and a temperature compensated
charging circuit with a charge indicating diode.
An AC transformer or solar panel should be
connected to the PS12 at all times. The
charging source powers the CR10X while float
charging the lead acid batteries. The internal
lead acid battery powers the datalogger if the
charging source is interrupted. The PS12LA
specifications are given in Table 14.3-2.
The two leads from the charging source can be
inserted into either of the CHG ports, polarity
doesn't matter. A transzorb provides transient
protection to the charging circuit. A sustained
input voltage in excess of 40 V will cause the
transzorb to limit voltage.
Some solar panels are supplied with a
connector, this connector must clipped off so
the two wires can be inserted into the two
terminal ports. It is recommended that these
two leads be stripped and tinned.
The red light (LED) on the PS12LA is on when a
charging source is connected to the PS12LA
CHG ports. The switch turns power on and off
to the 12 V ports, battery charging still occurs
when the switch is off.
CAUTION: Switch the power to "off" before
disconnecting or connecting the power
leads to the Wiring Panel. The Wiring
Panel and PS12LA are at power ground. If
12 V is shorted to either of these, excessive
current will be drawn until the thermal fuse
opens.
INT
EXT
BATT
CHG
OFF ON
CHG
CHG
+12
+12
1012
INT
EXT BATT
CHG
O F F O N
CHG
CHG
CHG Y
UASA BATTERY
Y U A S A
NP7 - 12 12
* CHARGING IN STRUCTION (AT 2000 )
SERIAL I/O
CR10X MEASUREMENT AND CONTROL MODULE firmware 1983, 1986, 1995 S/N: X 1012 C
CR10X WIRING PANEL
MADE IN U SA
WIRING PANEL NO.
G 12V POWER IN
EARTH CROUND
SE
DEF
G G H L AG H L AG E3 AG G G
L AG H
4 7 8 5 9 10
6 11 12
AG G G G
SW 12V CTRL
SW 12V
G
SE
DEF
G G H L AG H L AG E3 AG L AG H
1 1 2 2 3 4 3 5 6
G G H L AG H L AG E3 12V 12V L AG H SDM
LOGAN, U TAH
WARNING
:
MADE IN U SA
WITH 12V C
HARGING
REGULATO
R
PS12 POWER SUPPLY
Logan, Utah
PERMANEN T DAMAG E TO RECH ARGEABLE
CELLS MAY RESU LT IF DISCARG
ED
BELO W 10.5 VOLTS
FUNCT ION
INT
EXT BAT
CHG
OFF ON CHG
CHG
+12
+12
PS12 BATTERY
EXTERNAL BATTERY - DO NOT USE W
ITH
INTERNAL RECHARGEABLE BATTERY POWER TO +12 TERM
INALS INPUT FROM CHARGER OR SOLAR PANEL
16-26 VDC OR AC RMS: POSIT
IVE TO EITHER TERMINAL, NEGATIVE
TO OTHER
POWER TO DATALOGGER OR
12V PERIPHERALS
FIGURE 14.3-2 PS12LA
The external port, labeled EXT, is not meant to
be used with the PS12LA unless the internal
battery is removed. The primary power source
is the charging source, and the secondary
power source is the internal lead acid battery.
Connecting a lead acid battery to the external